A pneumatic brake booster with reduced dead travel comprising a skirt which can move in a sealed manner in a casing, delimiting a low-pressure chamber and a variable-pressure chamber, with respect to a pneumatic piston over a certain travel. The cardiac pacemaker can include a docking or delivery feature having a through-hole disposed on or near a proximal end of the pacemaker for attachment to the delivery system. A locking member within the one or more channels is movable along the channel to either engage or disengage the locking member from a recess formed in a side wall of the container. The phone includes a camera and a programmable memory. Engine reversal is detected by determining that the crank shaft has decelerated by more than a threshold value, or that the crank shaft has decelerated and then subsequently accelerated. The longitudinal axis of rotation of the folding belt extends parallel to the longitudinal fold line of the web.